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05:21 AM Ruby Bug #22384: Regexp compile error in the 2nd+ branch of a top-level alternation leaks the parse tree (regression from #13332, Ruby 4.0)

Fix and regression test: https://github.com/ruby/ruby/pull/19026. Verified on a build of v4.0.7 with the patch: Regexp.new("a|b(c") rescue nil goes from 134 B leaked per compile to 0, and 2M calls of /(?:a|b)c(d)/.to_s from +250 MB RSS t... sethuarun (Sethupathi Arunachalam)

04:39 AM Ruby Bug #22384 (Open): Regexp compile error in the 2nd+ branch of a top-level alternation leaks the parse tree (regression from #13332, Ruby 4.0)

**Affects:** ruby 4.0.6 and 4.0.7 (official docker images and a jemalloc-linked build), master (commit still present). **Not affected:** 3.4.6.
**Repro (plain Ruby, no extensions):**
```ruby
def rss_kb = File.read('/proc/self/status... sethuarun (Sethupathi Arunachalam)